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Re: [Idr] Can one Destination Address appear in both Tunnel Encap Attribute and in MP_REACH_NLRI ?

Srihari Sangli <ssangli@juniper.net> Thu, 17 October 2019 08:08 UTC

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From: Srihari Sangli <ssangli@juniper.net>
To: Robert Raszuk <robert@raszuk.net>, Srihari Sangli <ssangli=40juniper.net@dmarc.ietf.org>
CC: Linda Dunbar <linda.dunbar@futurewei.com>, "idr@ietf.org" <idr@ietf.org>, "draft-ietf-idr-tunnel-encaps@ietf.org" <draft-ietf-idr-tunnel-encaps@ietf.org>
Thread-Topic: [Idr] Can one Destination Address appear in both Tunnel Encap Attribute and in MP_REACH_NLRI ?
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Date: Thu, 17 Oct 2019 08:08:11 +0000
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Subject: Re: [Idr] Can one Destination Address appear in both Tunnel Encap Attribute and in MP_REACH_NLRI ?
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Hi Robert,



My reading of Linda's point was a question regarding the case where for prefix A NLRI points to
next hop NH_1 but tunnel endpoint says go to NH_2.

Is such update still valid ?

Has tunnel encapsulation attribute power to "overrule" BGP next hop from MP_REACH ?


The draft in Section 5 explains this. If the update has a valid Tunnel Encapsulation attribute and if any of the tunnel(s) is considered to be feasible, then it MUST use the tunnel. That means in your example, such an update is valid and NH_2 should be used.

Hope this helps. Thanks.

srihari…

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